Posts Tagged ‘algorithm’

Sorting PHP arrays with substrings

In: algorithms| data| php

10 Dec 2009
Sorting PHP arrays using usort with substrings

Luhn algorithm for validating credit cards

In: algorithms| php

9 Jul 2008
The Luhn algorithm also known as the “modulus 10″ or “mod 10″ algorithm, is a checksum formula which can be used to validate credit card numbers. Developed in the 1950’s by IBM scientist Hans Peter Luhn and described in U.S. Patent 2,950,048. A PHP implementation is shown below.   function LuhnCheck($strDigits) { $sum = 0; [...]

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